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Annotation of 43BSDTahoe/lib/libc/gen/gen.tahoe/setjmp.s, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1988 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that the above copyright notice and this paragraph are
                      7:  * duplicated in all such forms and that any documentation,
                      8:  * advertising materials, and other materials related to such
                      9:  * distribution and use acknowledge that the software was developed
                     10:  * by the University of California, Berkeley.  The name of the
                     11:  * University may not be used to endorse or promote products derived
                     12:  * from this software without specific prior written permission.
                     13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  *
                     17:  * This code is derived from software contributed to Berkeley by
                     18:  * Computer Consoles Inc.
                     19:  */
                     20: 
                     21: #if defined(LIBC_SCCS) && !defined(lint)
                     22:        .asciz "@(#)setjmp.s    1.4 (Berkeley) 6/27/88"
                     23: #endif /* LIBC_SCCS and not lint */
                     24: 
                     25: /*
                     26:  * C library -- setjmp, longjmp
                     27:  *
                     28:  *     longjmp(a,v)
                     29:  * will generate a "return(v)" from
                     30:  * the last call to
                     31:  *     setjmp(a)
                     32:  * by restoring registers from the stack,
                     33:  * previous signal mask, and doing a return.
                     34:  */
                     35: 
                     36: #include "DEFS.h"
                     37: 
                     38: ENTRY(setjmp, R6)
                     39:        movl    4(fp),r6                # construct sigcontext
                     40:        movab   -8(sp),sp               # space for current struct sigstack
                     41:        pushal  (sp)                    # get current values
                     42:        pushl   $0                      # no new values
                     43:        callf   $16,_sigstack           # pop args plus signal stack value
                     44:        movl    (sp)+,(r6)              # save onsigstack status of caller
                     45:        pushl   $0
                     46:        callf   $8,_sigblock            # get signal mask
                     47:        movl    r0,4(r6)                # save signal mask of caller
                     48:        addl3   $8,fp,8(r6)             # save stack pointer of caller
                     49:        movl    (fp),12(r6)             # save frame pointer of caller
                     50:        movl    -8(fp),20(r6)           # save pc of caller
                     51:        movpsl  24(r6)                  # save psl of caller
                     52:        clrl    r0
                     53:        ret
                     54: 
                     55: ENTRY(longjmp, 0)
                     56:        movl    8(fp),r0                # return(v)
                     57:        movl    4(fp),r1                # fetch buffer
                     58:        tstl    12(r1)
                     59:        beql    botch
                     60: loop:
                     61:        cmpl    12(r1),(fp)
                     62:        beql    done
                     63:        blssu   botch
                     64:        movl    $loop,-8(fp)
                     65:        ret                             # pop another frame
                     66: 
                     67: done:
                     68:        cmpb    *-8(fp),reiins          # returning to an "rei"?
                     69:        bneq    1f
                     70:        movab   3f,-8(fp)               # do return w/ psl-pc pop
                     71:        brw     2f
                     72: 1:
                     73:        movab   4f,-8(fp)               # do standard return
                     74: 2:
                     75:        ret                             # unwind stack before signals enabled
                     76: 3:
                     77:        addl2   $8,sp                   # compensate for PSL-PC push
                     78: 4:
                     79:        pushl   r1                      # pointer to sigcontext
                     80:        callf   $4,_sigreturn           # restore previous context
                     81:                                        # we should never return
                     82: 
                     83: botch:
                     84:        callf   $4,_longjmperror
                     85:        halt
                     86: 
                     87:        .data
                     88: reiins:        rei

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